• Transactions of the Korean Society of Mechanical Engineers B
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• v.36 no.2
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• pp.211-216
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• 2012

The availability of thermal energy has been widely recognized recently, and the cascade usage of thermal energy from combustion has been encouraged. Within this framework, a 1-kW-class Stirling-engine.based cogeneration system has been proposed as a unit of a distributed energy system. The capacity has been designed to be adequate for domestic usage, which requires high compactness as well as low emissions and noise. To develop a highly efficient system satisfying these requirements, a premixed slot-type short-flame burner has been proposed, and a series of experiments has been performed to understand its combustion characteristics. Flame images have been captured to observe the dependence of the flame mode on the combustion load and air/fuel ratio. The exhaust gas has been sampled and analyzed to study the emission characteristics for each flame mode.

• The Science & Technology
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• v.32 no.7 s.362
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• pp.30-31
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• 1999

오늘날 누구든지 정보의 바다 인터넷의 정보와 쉽게 접근할 수 있는 것은 바로 월드와이드 웹(WWW:웹으로 약칭. 거미집처럼 세계 정보망을 타고 전자문서를 자유자재로 검색할 수 있게 만든 인터넷의 게시판 서비스)이라는 매커니즘의 덕이라고 할 수 있다. 현대의 웹이 마치 그 옛날의 인쇄기처럼 중요한 가치를 지녔다고 해서 웹 발명자 버너즈-리를 '현대의 구텐베르크'라고 부르는 사람들이 많다. 그는 엘리트들만이 사용할 수 있던 강력한 통신시스템을 일반대중이 접근할 수 있는 매스미디어(대중매체)로 바꿔 버렸다. 만약에 이 발명이 전통적인 과학의 범주에 속한다면 그의 업적은 충분히 노벨상감이라고 평가하는 사람들도 있다.

• Explosives and Blasting
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• v.18 no.3
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• pp.49-58
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• 2000

본 논문은 양면발파에 의한 채석기술에서 주로 양면발파 장약패턴 및 다이아몬드 와이어쏘절삭기술에 관한 내용을 중심으로, 현재 각 석재광산에서 시행하고 있는 채석기술과 연구소 에서 시행한 현장 시험발파 결과를 기술한 것이다. 첫째, DA석재광산에서는 제트버너를 이용하여 자유면을 형성하고, 일면발파법과 양면발파법의 작업시간을 비교한 결과 양면 발파할 때에 37%이상의 작업시간 절약효과가 있었으며, 인원은 36%이상의 감소효과가 있었다.둘째, DH석재광산에서는 다이아몬드 와이어쏘를 이용하여 자유면을 형성하고 양면발파 작 업시간과 타 광산에서 일반적으로 사용하고 있는 제트버너에 의한 양면발파 작업시간을 비교하였을 때에 21%이상의 절감효과가 있었고, 작업인원도 21%이상의 감소효과가 있었다. 다이아몬드 와이어쏘를 이용하여 양측면에 자유면을 형성하고 양면 발파하는 채석기술은 소음 및 분진에 의한 환경공해를 방지할 수 있었으며, 작업공정 및 경제성 면에서도 매우 유 리하나 실패시 다른 채석기술에 비해 모암의 손상으로 인한 경제적 손실이 커질 수 있다는 단점도 있으므로 정밀한 발파설계 및 기술이 필요하다.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.6
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• pp.645-650
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• 2010

In this research, the problem of combustion and its system in Hyundai Heavy Industries and Sachuan Unison will be analyzed in order to provide some methods of thermal efficiency improvement and help to make a positive influence on fuel savings and their productivity. In forging industries, in order to improve the material properties of the industrial heating elements which are being used, depending on different operation conditions of system equipment and combustion systems, fuel consumption and material properties can get a profound influence. Thus, analyzing about combustion system characteristics of 100 tons heating furnace and heat treatment furnace which are in operation in Hyundai Heavy Industry will be done. In usual, air-fuel ratio is proper for capacity of burner installed in each heating device, otherwise burner gets an automatic turn down ratio. It has a profound influence on heating performance and precision of temperature because it is the fixed characteristics of every industrial furnace. Even if there are some methods to improve the heating performance of a furnace installed with a large capacity burner, it is very difficult to obtain the precision of temperature in maintenance interval. Based on this, performance of burner can be drove to best by improving combustion system. Proper Combustion characteristic for each heating interval was analyzed in heating furnace in Hyundai Heavy Industry. A project plan for improving fuel savings and increasing precision of temperature was presented in this research.

• Journal of Internet of Things and Convergence
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• v.7 no.3
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• pp.75-80
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• 2021

Since the optimization of the diesel engine for the ship cannot satisfy the NOx emission limit by the method of reducing the NOx emission, it is necessary to reduce the NOx by post-processing the exhaust gas. In this study, we will review the feasibility of designing a binary nozzle and mixing chamber duct for effectively converting the number of elements into NH3 in the oil burner for the SCR catalyst unit integrated duct in the ship under development through the computational heat flow analysis for the velocity distribution and temperature distribution.

• Clean Technology
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• v.26 no.3
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• pp.211-220
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• 2020

This experimental study investigates the design parameters to achieve ultra low NOx combustion of coal using a 80 kW capacity single-burner furnace. The influence of key design parameters such as SN, overall and burner-zone equivalence ratios, primary/secondary air ratio, overfire air (OFA) ratio were tested for a total of 81 cases. The results showed that weak swirl intensity of the burner leads to higher NOx emission whereas strong swirl intensity accompanies increased CO concentration desipte lower NOx emission. Therefore, finding an appropirate swirl intensity is essential for the burner design. Larger flow rate of secondary air increased NOx emission, whereas smaller flow rate stretches the flame and increased CO emission. The lowest NOx emission of 82 ppm (6% O₂) was achieved at the optimal condition of the present burner deisgn. It is expected to furrther lower the NOx emission by introducing splitting the burner secondary air into three or four streams.

• Journal of the Korean Society of Propulsion Engineers
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• v.21 no.4
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• pp.1-11
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• 2017

TPTF (Turbopump Real Propellant Test Facility) at Naro Space Center has used alcohol burner system to simulate the gas flow of gas generator of liquid rocket engine. During the test at TPTF, the temperature and pressure at turbine inlet were smoothly increased while those of the gas generator of engine were constant. Present research developed a simulation code for the burner and the piping system and applied to the system. The calculation results were in good agreement with the test, and confirmed quantitatively that the non-steadiness is due to the heat transfer of the pipe. While the insulation of the pipe is ineffective, the length has a large impact on the turbine inlet condition. The present research clarified the empirically estimation of test condition, and can be applied to determination of the following test conditions.

• 한국연소학회:학술대회논문집
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• 2004.06a
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• pp.242-247
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• 2004

An Experimental study was conducted on spray combustion using dual swirlers at different outlet angle; co-swirl and counter-swirl. To understand the characteristics of turbulent spray combustion of dual swirl flow (DSF), the axial helical annular vaned swirlers with various swirl ratios and combination of angle and direction were designed. and temperature measurements of a rapidly thermocouple insertion and measurements of soot volume fraction and microrstructure using thermophoretic sampling particle diagnostic (TSPD) as TEM were carried out. The NOx, $CO_2$, $O_2$, etc. was analyzed using emission gas analyzer. The results show that flame stability were maintained under very lean condition. for both co-swirl and counter-swirl case. And though Counter-swirl case kept the higher temperature region compared to co-swirl case, Counter-swirl combustion represented less NOx emission and soot formation than co-swirl case.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.3
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• pp.405-410
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• 2011

The heat treatment of the steel is very important part on the forging industry. It is also effect to price competitiveness. The burner control system of the heat treating furnace is related LNG gas saving and fixed manufactured goods rate. This study show the burner control performance of the heat treating furnace. The result developed the performance of the heat treating furnace and show energy saving.

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.145-146
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• 2014